Transformation-mismatch superplasticity in reinforced and unreinforced titanium

D. C. Dunand*, C. M. Bedell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

Samples of commercial-purity titanium, with and without 10 vol.% TiC particulates, were thermally cycled about the allotropic transformation temperature of titanium. Thermal ratcheting was small for both unstressed materials. Upon application of an external uniaxial tensile stress, unreinforced titanium exhibited large strain increments, resulting from the biasing by the applied stress of the volume mismatch developed between grains during the transformation. Upon repeated cycling, a strain to fracture of 200% was reached, with a strain per cycle proportional to the external stress, in agreement with existing transformation-mismatch superplasticity models. The metal matrix composite displayed transformation-mismatch superplasticity as well, with a strain to fracture of 135% and a strain per cycle significantly higher than for unreinforced titanium. This novel enhancement of superplastic strain is modeled by considering the internal mismatch between the transforming matrix and the non-transforming particulates.

Original languageEnglish (US)
Pages (from-to)1063-1076
Number of pages14
JournalActa Materialia
Volume44
Issue number3
DOIs
StatePublished - Mar 1996

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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